CVE-2026-59880
Immutable.js: Hash-collision algorithmic complexity denial of service in Immutable.Map/Set
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
Immutable.js provides many Persistent Immutable data structures. Prior to 4.3.9 and 5.1.8, Immutable.Map and Immutable.Set keep keys that share the same 32-bit hash in a HashCollisionNode collision bucket that is scanned linearly, allowing an attacker who controls keys inserted into a Map, such as through Immutable.Map(obj), Immutable.fromJS(obj), state.merge(userObject), or mergeDeep, to craft many colliding keys and degrade insertion and lookup to consume disproportionate CPU. This issue is fixed in versions 4.3.9 and 5.1.8.
| CWE | CWE-407 |
| Vendor | immutable-js |
| Product | immutable-js |
| Published | Jul 8, 2026 |
| Last Updated | Jul 8, 2026 |
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Affected Versions
immutable-js / immutable-js
< 4.3.9 >= 5.0.0-beta.1, < 5.1.8
References
github.com: https://github.com/immutable-js/immutable-js/security/advisories/GHSA-xvcm-6775-5m9r github.com: https://github.com/immutable-js/immutable-js/commit/3dd7e5655012597a41873e328bf9142a8901527b github.com: https://github.com/immutable-js/immutable-js/commit/e51d49fc612ded5ec4dfb94ff294d22074269b0f github.com: https://github.com/immutable-js/immutable-js/releases/tag/v4.3.9 github.com: https://github.com/immutable-js/immutable-js/releases/tag/v5.1.8